She added that the man and woman, who were seated behind her, spoke with foreign accents and added: “They spoke in English but both in foreign accents, so both must have been different nationalities. Jeez some people! It was disgusting in any language!”

She said the incident had taken place before Barry Bannan’s 82nd minute leveller which saw the Owls rescue a point.

The sex act is said to have taken place on The Kop during Saturday's game.

Responding to fans questioning whether the incident had taken place, she wrote: “This definately (sic) DID happen! I saw it with my own eyes! Wish I hadn't!